Vellak, K., N. Ingerpuu, L. Kannukene, M. Leis, and B. Kullman. “New Estonian Records and Amendments. Liverworts and Mosses. Pezizales (Ascomycetes)”. Folia Cryptogamica Estonica, Vol. 45, 1, pp. 91-93, http://ojs.utlib.ee/index.php/FCE/article/view/13677.